Mug cover



FIG. 1 is a top view of a mug cover in a fully open position, according to present design;

FIG. 2 is a perspective view of the mug cover of FIG. 1 in a semi-closed position; and,

FIG. 3 is a perspective view of the mug cover of FIG. 1 in a closed position. 

The ornamental design for a mug cover, as shown. 